How is oxygen carried by the blood and carbon dioxide given out?

Fill in the blank with a most appropriate word from the bracket.

The food from the mouth goes into the _____. (oesophagus/windpipe)

Fill in the blank with the most appropriate word from the bracket.

A group of organs together are called an _____. (organ system / food pipe / blood)

Fill in the blank with most appropriate word from the bracket.

The small intestine is about _____ feet in length. (30/20/40)

Fill in the blank with the most appropriate word from the bracket.

_____ is the largest organ in the body. (Liver / Kidney / Heart)

Fill in the blank with most appropriate word from the bracket.

Air entering our body is filtered by _____ in the nose. (nasal cavity / wind pipe)